I think you'll find that a kick coil is simpler than an induction coil : its just a single coil on a soft iron core, with an interrupter assembly. The coil works by creating peaks of HV as the interrupter opens and the field collapses. ("The Amateur Scientist" C.L.Stong, had full details for an Oudin coil outfit) Regards Chris cdobson-at-microtech-dot-com.au Riana, TAS